Shoe sole member, method for producing the same, and shoe

Abstract

Provided is a shoe sole member formed by at least two types of polymer compositions, a first composition and a second polymer composition, including: a first part formed by the first polymer composition; a second part formed by the second polymer composition; and a third part formed by a mixture of the first polymer composition and the second polymer composition between the first part and the second part.

The invention claimed is: 
     
       1. A shoe sole member, formed by at least two different polymer compositions, a first polymer composition and a second polymer composition, comprising:
 a first part formed by the first polymer composition; 
 a second part formed by the second polymer composition; and 
 a third part formed by a mixture of the first polymer composition and the second polymer composition between the first part and the second part, wherein:
 the first part has an Asker C hardness higher than the second part, 
 the value of an Asker C hardness of the third part in a cross section orthogonal to a central axis of the shoe sole member changes both when the measurement point moves in a horizontal direction and when the measurement point moves in a vertical direction, 
 the value of the Asker C hardness of the third part continuously decreases throughout the third part from a side of the first part toward a side of the second part, and 
 the value of the Asker C hardness of the third part continuously decreases throughout the third part both upward and downward thickness directions from a center of the third part. 
 
 
     
     
       2. The shoe sole member according to  claim 1 , when a sectional area of the first part is denoted by S11, a sectional area of the second part is denoted by S12, and a sectional area of the third part is denoted by S13, in a cross section orthogonal to a central axis of the shoe sole member, the shoe sole member satisfying the following relational expression (1):
   5%<[100× S 13/( S 11+ S 12+ S 13)]<100%  (1).
 
 
     
     
       3. The shoe sole member according to  claim 1 , when a sectional area of the first part is denoted by S21, a sectional area of the second part is denoted by S22, and a sectional area of the third part is denoted by S23, in a vertical section that is a vertical plane parallel to a central axis of the shoe sole member, the shoe sole member satisfying the following relational expression (4):
   5%<[100× S 23/( S 21+ S 22+ S 23)]<100% . . .  (4).
 
 
     
     
       4. The shoe sole member according to  claim 1  wherein the first part is arranged toward an inner foot side and the second part is arranged more toward an outer foot side than the first part. 
     
     
       5. The shoe sole member according to  claim 1  wherein the first part covers an inner foot side and the second part covers an outer foot side. 
     
     
       6. The shoe sole member according to  claim 1  wherein the first part is arranged toward a forefoot and the second part is arranged more toward a hindfoot than the first part. 
     
     
       7. The shoe sole member according to  claim 1  wherein the first part covers a forefoot and the second part covers a hindfoot. 
     
     
       8. A shoe comprising the shoe sole member according to  claim 1 .